Comment by ricksunny

I've tried to chase down the literature on the genetic basis for DSPS. It's still a developing field, but there have been some compelling studies that are narrowing down gene loci for night-owls.

1. https://www.nature.com/articles/npp2009230 2. https://link.springer.com/article/10.1007/s00125-015-3533-8 3. https://www.sjweh.fi/article/3299